Xie Aijuan, Zhou Wenting, Luo Shiping, Chen Yu, Zhou Xiaoqing, Chao Yao
J Nanosci Nanotechnol. 2017 Feb;17(2):1092-098. doi: 10.1166/jnn.2017.12643.
A facile Pt nanoflowers/nitrogen-doped graphene (PtNFs/NG) electrocatalyst was prepared via depositing Pt nanoflowers (PtNFs) onto the nitrogen-doped graphene (NG) matrix with urea as the nitrogen source and PtNFs/NG modified glassy carbon electrode (GCE) was prepared by electro-chemical method. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Raman spectroscope, X-ray photoelectron spectroscopy (XPS) and Scanning electron microscope (SEM) were used to characterize the resulting composites. Also oxidation of formaldehyde on the resulting PtNFs/NG modified electrode was investigated. The influence of deposition time, electrodeposition potential and formaldehyde concentration on electrooxidation of formaldehyde was detected, the experimental results indicate the high performance of PtNFs/NG catalyst for formaldehyde oxidation is at electrodeposition time of 300 s with the applied potential of −0.3 V. Electrochemical process, electrocatalytic stability and chronoamperometry were also inspected, it was indicated that formalde-hyde oxidation reaction on the PtNFs/NG electrode is diffusion-controlled and PtNFs/NG exhibits a high catalytic activity, stability as well as excellent poisoning-tolerance towards formaldehyde oxidation, which is attributed to the synergistic effect of PtNFs and NG. It turns out that PtNFs/NG can be used in direct liquid-feed fuel cells as a promising alternative catalyst.
通过以尿素作为氮源将铂纳米花（PtNFs）沉积在氮掺杂石墨烯（NG）基体上制备了一种简便的铂纳米花/氮掺杂石墨烯（PtNFs/NG）电催化剂，并采用电化学方法制备了PtNFs/NG修饰玻碳电极（GCE）。利用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、拉曼光谱仪、X射线光电子能谱（XPS）和扫描电子显微镜（SEM）对所得复合材料进行了表征。此外，还研究了所得PtNFs/NG修饰电极上甲醛的氧化。检测了沉积时间、电沉积电位和甲醛浓度对甲醛电氧化的影响，实验结果表明，PtNFs/NG催化剂在300 s的电沉积时间和-0.3 V的外加电位下对甲醛氧化具有高性能。还考察了电化学过程、电催化稳定性和计时电流法，结果表明PtNFs/NG电极上的甲醛氧化反应是扩散控制的，PtNFs/NG对甲醛氧化表现出高催化活性、稳定性以及优异的抗中毒性能，这归因于PtNFs和NG的协同效应。结果表明，PtNFs/NG可作为一种有前景的替代催化剂用于直接液体进料燃料电池。
